Not assigned |
Not assigned |
Trichoplacidae
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع
بوم شناسي
Benthic. Tropical
Circumglobal.
طول در اولین بلوغ / اندازه / وزن / سن
بلوغ: Lm ? range ? - ? cm
Flat (up to 0.5mm in its longest dimension), multicellular, amorphous, mobile flagellated animal lacking body cavity, digestive and nervous systems, composed of 2 layers of epithelial cells. Associated glandular cells apparently secrete digestive enzymes beneath the animal as it sits atop the algae and protozoans on which it apparently feeds; digestion seems to be entirely extracellular , as there is no mouth and no sign of phagocytosis. The much thinner, upper layer of the animal bears flagellated cells, but no gland cells. In a sense, the upper layer is ectodermal, while the lower layer, because of its involvement in digesting food and absorbing nutrients, is endodermal. Between the upper and lower cell layers is a fluid-filled space containing a dense network of fibrous cells that may be contractile (Ref. 53).
Commonly found in warm marine environments (Ref. 57) and in marine aquaria (Ref. 59), on hard bottom substrates in the benthic regions (Ref. 53). A scavenger which feeds on dead animals with its ventral surface, which produces digestive enzymes (Ref. 53), and also feeds on Cryptomonas (Ref. 57 and 60) and algae (Ref. 59); often, individuals contract part of the ventral surface into a sac where digestion may take place more efficiently (Ref. 60).
چرخه زندگی و رفتار جفت‌گیری
بلوغ | تولید مثل | تخم ریزی | تخم ها | باروری | توزاد ( لارو)
Reproduces asexually, binary fission, budding (Ref. 60), fragmentation (Ref. 53). Older cultures at high density begin to produce small motile presumptive sperm cells, and as individual animals disintegrate, they spew out ova (Refs. 59, 61).
مآخذ اصلی
مراجع | هماهنگ كننده | همكاران
Collins, A.G. 2000 Intoduction to Placozoa. Tree of Life Web Project. http://www.ucmp.berkeley.edu/phyla/placozoa/placozoa.html (مرجع 60)
وضعيت در فهرست قرمز IUCN
(مرجع 130435: Version 2025-2 (Global))
وضعيت از نظر سايتس (مرجع 108899)
Not Evaluated
Not Evaluated
خطر برای انسان ها
Harmless
استفاده انسانی
FAO - Publication: search | FishSource |
ابزارها
اطلاعات بيشتر
پویایی جمعیترشد
حداکثر سن/اندازه
نسبت طول-وزن.
طول-طول نسبی.
نوسانات طولی
تبدیل انبوه
فراواني
چرخه زندگیتولید مثلبلوغباروریتخم ریزیتخم هانمو تخمتوزاد ( لارو) مرتبط با انسانتمبر، سکه، متفرقه.
منابع اينترنتي
تخمین‌ها بر اساس مدل‌ها
آسیب‌پذیری ماهیگیری
(مرجع 71543) |
(0 of 100). |
طبقه قيمت
(مرجع 80766): |
Unknown. |
